Coffee grinder



FIG. 1 is a top front perspective view of a coffee grinder showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof; and

FIG. 4 is a top plan view thereof.

The base of the coffee grinder is plain and unornamented. 

The ornamental design for a coffee grinder, as shown and described. 